#!/usr/bin/env bash

# This script is used to build the rln library for the current platform, or download it from the
# release page if it is available.

set -e

# first argument is the build directory
build_dir=$1
rln_version=$2
output_filename=$3

[[ -z "${build_dir}" ]]       && { echo "No build directory specified"; exit 1; }
[[ -z "${rln_version}" ]]     && { echo "No rln version specified";     exit 1; }
[[ -z "${output_filename}" ]] && { echo "No output filename specified"; exit 1; }

# Get the host triplet
host_triplet=$(rustc --version --verbose | awk '/host:/{print $2}')

# Download the prebuilt rln library if it is available
if curl --silent --fail-with-body -L \
  "https://github.com/vacp2p/zerokit/releases/download/$rln_version/${host_triplet}-rln.tar.gz" \
  -o "${host_triplet}-rln.tar.gz";
then
    echo "Downloaded ${host_triplet}-rln.tar.gz"
    tar -xzf "${host_triplet}-rln.tar.gz"
    mv "release/librln.a" "${output_filename}"
    rm -rf "${host_triplet}-rln.tar.gz" release
else
    echo "Failed to download ${host_triplet}-rln.tar.gz"
    # Build rln instead
    # first, check if submodule version = version in Makefile
    cargo metadata --format-version=1 --no-deps --manifest-path "${build_dir}/rln/Cargo.toml"
    submodule_version=$(
      cargo metadata --format-version=1 --no-deps --manifest-path "${build_dir}/rln/Cargo.toml" \
        | jq -r '.packages[] | select(.name == "rln") | .version'
    )
    if [[ "v${submodule_version}" != "${rln_version}" ]]; then
        echo "Submodule version (v${submodule_version}) does not match version in Makefile (${rln_version})"
        echo "Please update the submodule to ${rln_version}"
        exit 1
    fi
    # if submodule version = version in Makefile, build rln
    cargo build --release -p rln --manifest-path "${build_dir}/rln/Cargo.toml"
    cp "${build_dir}/target/release/librln.a" "${output_filename}"
fi